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A regurgitalite of the Middle Triassic (Muschelkalk) from Upper Silesia (Poland)

Niedźwiedzki Robert, Surmik Dawid, Chećko Agnieszka, Salamon Mariusz A.

Geology, Geophysics and Environment

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2021

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Vol. 47, no. 1

33--40

EN

A bromalite from the Middle Triassic (Muschelkalk) of southern Poland, Sadowa Góra Quarry, is herein described and interpreted as a regurgitalite. The fossils occurring within the regurgitalite are angular and have sharp edges. They are represented by common fragments of thin-shelled bivalves as well as rare crinoid and gastropod remains. The composition of the collected inclusion is different from that of the host rock. There are many candidates that could have produced the regurgitalite, including durophagous sharks, marine reptiles, the actinopterygian Colobodus, or nautiloids. Our finding adds to the emerging evidence of durophagous predation in the Triassic sea of Polish part of the Germanic Basin. It is the second record of a regurgitalite from the Muschelkalk of Upper Silesia.

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An early Middle Anisian (Middle Triassic) Tubiphytes and cement crusts-dominated reef from North Dobrogea (Romania): facies, depositional environment and diagenesis

Popa L., Panaiotu C. E., Grădinaru E.

Acta Geologica Polonica

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2014

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Vol. 64, no. 2

189--206

EN

A well-developed Triassic carbonate platform is exposed in the eastern part of the Tulcea Unit, in the Cimmerian North Dobrogean Orogen, southeastern Romania. Facies analysis of the 200 m thick succession of lower Middle Anisian limestones exposed in a large limestone quarry south of the village of Mahmudia suggests a transition from upper slope towards toe-of-slope carbonate facies, reflecting sea-level fluctuations and tectonic tilting. The slope is dominated by in situ microbialites in the upper portion, consisting of reefal boundstone facies, and by molluscan coquina and cement boundstones. A key role is played by the cosmopolitan micro-encruster Tubiphytes, which became common in the aftermath of the mass extinction at the Permian/Triassic boundary, and by autochthonous micrite and synsedimentary marine cement. The absence of metazoan reef builders, such as sponges and corals, reflects the fact that microbes were the first organisms to recover after the Permian/Triassic crisis under unusual marine conditions and that their main role in reef formation was sediment stabilization along the upper slopes. The lower slope is mostly detrital, being dominated by platform-derived bioclastic rudstones and crinoidal floatstones, which are interbedded with basinal carbonate hemipelagics. The toe-of-slope is composed of pelagic wackestones framed by thin tongues of intraclast breccia. All these observations are in agreement with the slopeshedding model described for the Pennsylvanian microbial margin in Asturias (northern Spain) and the Anisian– Ladinian flat-topped, steep-rimmed Latemar platform (Dolomites, Italy). As most of the Anisian reefs were described from western and eastern Tethys (Southern Alps, Hungary, China), the occurrence of the early Middle Anisian Tubiphytes-reef from North Dobrogea (Romania) contributes to resolving the puzzle of the geographic distribution of reef recovery in the Middle Triassic.

3

Nowy zespół kręgowców z marginalnomorskich i lądowych osadów dolnego kajpru (ladyn, środkowy trias) z Miedar na Śląsku

Sulej T., Niedźwiedzki G., Niedźwiedzki R., Surmik D., Stachacz M.

Przegląd Geologiczny

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2011

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Vol. 59, nr 5

426-426

EN

Vertebrate remains, mostly nothosaurid vertebrae and long bones, archosaur partially preserved long bones and teeth (probably rauisuchid remains), fish teeth and scales, are described from the Lower Keuper Miedary Beds (Ladinian, Middle Triassic) of Miedary, Silesia, SW Poland. The analyzed vertebrate fossils were collected from three lithologically different types of deposits. The first assemblage, which contains nothosaurid and fish remains, occurs in yellowish dolomites, where poorly preseved invertebrate macrofossils were also found (marine bivalves and brachiopods). In grey-yellowish, sometimes greenish or red clays, rare isolated bones and teeth of large archosaur were found. In sandstone intercalations partially preserved and highly disarticulated fish fossils were identified. In all assemblages osteological remains are generally very well preserved. This new interesting vertebrate bones association from the upper part of the Middle Triassic marginal-marine strata of Poland has been correlated with age-equivalents from other regions of Europe.

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Środowisko sedymentacji i wczesna diageneza czarnych łupków ogniwa Passhatten (środkowy trias, Spitsbergen, Svalbard) na podstawie analizy geochemicznej

Karcz P.

Przegląd Geologiczny

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2009

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Vol. 57, nr 10

918-926

EN

Geochemical analysis of the 50 samples of the Middle Triassic black shales (organic carbon-rich siltstones) has been carried out. The black shale samples (up to 4.92 % TOC) have been collected in the stratotype profile of the Bravaisberget Formation, west Spitsbergen. In the examined profile, the black shales occur exclusively in the Passhatten Member (the lower and middle interval of the Bravaisberget Formation). Black shale samples have been analyzed in respect to degree of pyritization (DOP), isotopic composition of pyrite sulphur (34S) and organic carbon content (TOC). The main goal of the research was to examine a degree of oxygenation and dynamics of a sea-bottom environment. DOPvalues from lower section of the Passhatten Member show wide variation, ranging from 0.29 to 0.92. In upper section of the member, the obtained DOPvalues show narrower range of variations, from 0.77 to 0.98.Wide variations of DOPwere caused by temporary coexistence of oxic and anoxic bottom currents. In turn, narrow DOP variations indicate predominance of stratified water and anoxic bottom currents. DOP/34S and DOP/TOC ratios imply that syngenetic and early diagenetic pyrite precipitation during accumulation of the lower section of the Passhatten Member was controlled by availability of organic carbon and reactive iron, whereas accumulation of the member's upper section was controlled exclusively by availability of reactive iron.

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Stanowisko kręgowców środkowego triasu koło Żyglina na Górnym Śląsku

Bardziński W., Surmik D., Lewandowski M.

Przegląd Geologiczny

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2008

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Vol. 56, nr 7

532-536

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Środkowotriasowa ichnofauna kręgowców z "warstw z Krynek" w Górach Świętokrzyskich : wstępny przegląd

Niedźwiedzki G., Kin A., Remin Z., Małkiewicz M.

Przegląd Geologiczny

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2007

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Vol. 55, nr 10

870-879

EN

Numerous specimens of vertebrate tracks were discovered in the uppermost Röt (uppermost Buntsandstein) deposits of "Krynki Beds" that crop out at Witulin, Parszów, Małe Jodło, Jarugi, Bliżyn, and Sorbin in the north-eastern and central margin of the Holy Cross Mountains, Poland. The following vertebrate ichnotaxa were identified in these localities: Chirotherium barthii Kaup, 1835; Chirotherium cf. sickleri; Synaptichnium cf. diabloense; Isochirotherium herculis (Egerton, 1839); ? Isochirotherium cf. herculis; Isochirotherium isp.; Chirotheriidae indet.; Rhynchosauroides isp., and Rhynchosauroidae indet. The ichnoassemblage from the "Krynki Beds" is very similar to ichnoassociations which are known from: 1) latest Early and early Middle Triassic (Upper Buntsandstein) deposits of the Central European Basin, 2) latest Early and early Middle Triassic Moenkopi Formation of USA, 3) Middle Triassic deposits of United Kingdom, France and Italy.